74 lines
2.1 KiB
JavaScript
74 lines
2.1 KiB
JavaScript
|
/**
|
||
|
|
* @fileoverview Rule to flag duplicate arguments
|
||
|
|
* @author Jamund Ferguson
|
||
|
|
*/
|
||
|
|
|
||
|
|
"use strict";
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Rule Definition
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
meta: {
|
||
|
|
docs: {
|
||
|
|
description: "disallow duplicate arguments in `function` definitions",
|
||
|
|
category: "Possible Errors",
|
||
|
|
recommended: true
|
||
|
|
},
|
||
|
|
|
||
|
|
schema: []
|
||
|
|
},
|
||
|
|
|
||
|
|
create(context) {
|
||
|
|
|
||
|
|
//--------------------------------------------------------------------------
|
||
|
|
// Helpers
|
||
|
|
//--------------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks whether or not a given definition is a parameter's.
|
||
|
|
* @param {eslint-scope.DefEntry} def - A definition to check.
|
||
|
|
* @returns {boolean} `true` if the definition is a parameter's.
|
||
|
|
*/
|
||
|
|
function isParameter(def) {
|
||
|
|
return def.type === "Parameter";
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Determines if a given node has duplicate parameters.
|
||
|
|
* @param {ASTNode} node The node to check.
|
||
|
|
* @returns {void}
|
||
|
|
* @private
|
||
|
|
*/
|
||
|
|
function checkParams(node) {
|
||
|
|
const variables = context.getDeclaredVariables(node);
|
||
|
|
|
||
|
|
for (let i = 0; i < variables.length; ++i) {
|
||
|
|
const variable = variables[i];
|
||
|
|
|
||
|
|
// Checks and reports duplications.
|
||
|
|
const defs = variable.defs.filter(isParameter);
|
||
|
|
|
||
|
|
if (defs.length >= 2) {
|
||
|
|
context.report({
|
||
|
|
node,
|
||
|
|
message: "Duplicate param '{{name}}'.",
|
||
|
|
data: { name: variable.name }
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//--------------------------------------------------------------------------
|
||
|
|
// Public API
|
||
|
|
//--------------------------------------------------------------------------
|
||
|
|
|
||
|
|
return {
|
||
|
|
FunctionDeclaration: checkParams,
|
||
|
|
FunctionExpression: checkParams
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|
||
|
|
};
|